This work presents a study on adsorption characteristics of two anionic (SDS and
SDBS) and one cationic (CTAB) surfactants at airwater interface in presence of
inorganic salt (NaCl). Coalescence of air bubbles in these solutions is studied by
measuring the rest time of air bubbles at flat airwater interface. Significant effects of salt
on surface tension and coalescence are observed. Surface tension is reduced in presence of
salt and rest time is increased. The stochastic model developed earlier by Ghosh and Juvekar
(2002; Chem Eng Res Des, 80: 715728) fits the rest time distributions very well. A comparison
of seven film-drainage models with the mean values of these distributions is presented. It
is observed that these models, within the limitations of the simplifying assumptions behind
their development, can not predict the values of rest time accurately.
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